Pith Number

pith:GCHS5K2D

pith:2026:GCHS5K2DZM6IMDLGTGYWP3WH2A

not attested not anchored not stored refs resolved

Observation of a $B_c^{*+}$ meson with the ATLAS detector

ATLAS Collaboration

ATLAS observes the B_c^{*+} meson decaying to B_c^+ plus a photon with over 8 sigma significance

arxiv:2605.16228 v1 · 2026-05-15 · hep-ex

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\usepackage{pith}
\pithnumber{GCHS5K2DZM6IMDLGTGYWP3WH2A}

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Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Claims

C1strongest claim

The new state is observed with a significance that exceeds 8 standard deviations. The mass difference between the new meson state and the ground-state B_c^+ meson is measured to be 64.5 ± 1.4(stat.)^{+1.0}_{-1.4}(syst.) MeV. This corresponds to a mass for the observed state of 6339.0 ± 1.4(stat.)^{+1.0}_{-1.4}(syst.) ± 0.3(m_{B_c^+}) MeV. The low mass difference value matches the theory expectations for the lowest vector state of the b-bar c quarkonium system, the B_c^{*+} meson.

C2weakest assumption

The photons reconstructed via conversions to electron-positron pairs in the detector material, together with the three-muon final state, correctly isolate the signal without significant contamination from misidentified backgrounds or other processes that could produce a fake peak at the reported mass difference.

C3one line summary

First observation of the B_c^{*+} meson with mass difference 64.5 MeV from the ground-state B_c^+ at >8 sigma significance using ATLAS data.

References

66 extracted · 66 resolved · 41 Pith anchors

[1] Brambilla et al.,Heavy Quarkonium Physics, 2004, arXiv:hep-ph/0412158 2004

[2] Y.-Q. Chen and Y.-P. Kuang, Improved QCD-motivated heavy-quark potentials with explicitΛM𝑆 dependence, Phys. Rev. D46(1992) 1165 1992

[3] L. P. Fulcher, Z. Chen and K. C. Yeong, Energies of quark-antiquark systems, the Cornell potential, and the spinless Salpeter equation, Phys. Rev. D47(1993) 4122 1993

[4] The excited bottom-charmed mesons in a nonrelativistic quark model 2019 · arXiv:1903.11927

[5] G.-L. Wang, T. Wang, Q. Li and C.-H. Chang, The mass spectrum and wave functions of the B𝑐 system, JHEP05(2022) 006, arXiv:2201.02318 [hep-ph] 2022

Formal links

1 machine-checked theorem link

Receipt and verification

First computed	2026-05-20T00:01:59.038096Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

308f2eab43cb3c860d6699b167eec7d03e1cd16fc81a3b8fd8d72b3557f9d49d

Aliases

arxiv: 2605.16228 · arxiv_version: 2605.16228v1 · doi: 10.48550/arxiv.2605.16228 · pith_short_12: GCHS5K2DZM6I · pith_short_16: GCHS5K2DZM6IMDLG · pith_short_8: GCHS5K2D

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/GCHS5K2DZM6IMDLGTGYWP3WH2A \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: 308f2eab43cb3c860d6699b167eec7d03e1cd16fc81a3b8fd8d72b3557f9d49d

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "aec1d771332f1fb40539c20286f261d0bde1713347a33dc1f989cf58998572e5",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "hep-ex",
    "submitted_at": "2026-05-15T17:39:38Z",
    "title_canon_sha256": "bc768d2b011b51c186add4b42fc71c51085d34ed1f51db20b06878896feb3202"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.16228",
    "kind": "arxiv",
    "version": 1
  }
}